YOU SAID:
If I think therefore I am, then, if I do not think, am I not?
INTO JAPANESE
ですから、私がそうではないと思うのであれば、そうではありませんか。
BACK INTO ENGLISH
So, if I do not think so, is not it?
INTO JAPANESE
それで、私がそう思わないならば、そうではないですか?
BACK INTO ENGLISH
So, if I do not think so, is not it?
You've done this before, haven't you.